its a vpk file just simply install it like you install any other vpk games.

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Just to add a correction. There are two Gohans floating about. GoHAN SAVE EDITOR is the vpk, it works like any other vpk, and it edits SAVES. GoHANmem, on the other hand, is not a vpk. It is a plugin, the same as rincheat. It edits in-game, and is activated, latest version IIRC, through Right directional arrow + select.